/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search licenses this
 * file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.cluster;

import org.elasticsearch.cluster.node.DiscoveryNodes;

/**
 * @author kimchy (Shay Banon)
 */
public class ClusterChangedEvent {

    private final String source;

    private final ClusterState previousState;

    private final ClusterState state;

    private final boolean firstMaster;

    private final DiscoveryNodes.Delta nodesDelta;

    public ClusterChangedEvent(String source, ClusterState state, ClusterState previousState, boolean firstMaster) {
        this.source = source;
        this.state = state;
        this.previousState = previousState;
        this.firstMaster = firstMaster;
        this.nodesDelta = state.nodes().delta(previousState.nodes());
    }

    /**
     * The source that caused this cluster event to be raised.
     */
    public String source() {
        return this.source;
    }

    public ClusterState state() {
        return this.state;
    }

    public ClusterState previousState() {
        return this.previousState;
    }

    public boolean routingTableChanged() {
        return state.routingTable() != previousState.routingTable();
    }

    public boolean metaDataChanged() {
        return state.metaData() != previousState.metaData();
    }

    public boolean localNodeMaster() {
        return state.nodes().localNodeMaster();
    }

    public boolean firstMaster() {
        return firstMaster;
    }

    public DiscoveryNodes.Delta nodesDelta() {
        return this.nodesDelta;
    }

    public boolean nodesRemoved() {
        return nodesDelta.removed();
    }

    public boolean nodesAdded() {
        return nodesDelta.added();
    }

    public boolean nodesChanged() {
        return nodesRemoved() || nodesAdded();
    }
}
